break: 结束本层循环，进入下层循环
return: 两层循环都结束
continue:结束本次循环，开始下次循环
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<p>该实例中，break 语句用在了引用标签"Loop2"上。在 j 等于 12 时，break 语句用于跳出 Loop2 循环。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
var text = "";
var i, j;
Loop1: // 第一个引用标签 "Loop1"
for (i = 0; i < 3; i++) {
debugger
text += "<br>" + "i = " + i + ", j = ";
Loop2: // 第二个引用标签 "Loop2"
for (j = 10; j < 15; j++) {
if (j == 12) {
debugger
return
}
document.getElementById("demo").innerHTML = text += j + " ";
}
}
}
</script>
</body>
</html>
标签：return,text,break,continue,Loop2,循环 From： https://www.cnblogs.com/harryzong/p/17026572.html